| Filtrexx™ Filter Rings™ are to be used for temporary filtration in situations that allow space for separation of water from solids in a passive manner. Filtrexx™ Filter Rings™ are a scalable system for filtering a number of contaminants from stormwater, sump water, and other situations requiring filtration prior to offsite discharge. Filter Rings™ are an inexpensive option compared to other competing products and are simple to maintain. If they fill up, simply add more Filter Rings™ in a larger diameter. Scaleable filtration is available via sizes in diameter of the FilterSoxx™, filtration rate of material, or diameter of Filter Rings™. Add multiple Filter Rings™ for tough flow rates.
Conditions where practice applies
Use Filtrexx™ Filter Rings™ in areas where dredging slurry or high water content effluent create problems with water quality. This might include pump around situations in streambank construction projects, overflow situations and other temporary filtration projects. It is imperative to have enough space on site to allow water to percolate through the Filtersoxx™ and drain away, leaving the sediment or filtrate behind. After water has been removed, filter cake or filtrate can be scooped up and disposed of or land applied, depending on the nature of the material. This practice stands to save significant monies compared to disposal of high water content solids without filtration.
Design Criteria
Design limits - Filtrexx™ Filter Rings™ are designed to be used outdoors and are subject to ambient weather conditions. Additional rainfall may reduce speed and effectiveness. During project design, flow through rates should be selected that match design goals for the project.
Spacing – see specifications. Filter Rings™ are friendly in design because if the flow rates are higher or lower than expected, new ones may be constructed larger or smaller in diameter to accommodate the difference. If more than one ring is required to slow filtration water, leave a minimum of one foot{.30m} spacing between Rings™.
Orientation – In general, the Filtrexx™ Filter Rings™ are installed in a circular pattern. However, depending on the site conditions, many other shapes may be used, including a partially open horseshoe or half circle.
Staking – The ends of the Filtrexx™ Filter Rings™ should be overlapped and staked (see CAD drawings). In areas of poor ground contact, additional stakes should be added every 2-5 feet{.60 -1.5m} On pavement or concrete applications, Filter Rings™ should be depressed when installed in order to maximize ground contact and footprint.
Planning considerations
Filter Rings™ are a passive filtration device and operate based on a constant or reducing flow through rate. They are not capable of suddenly increasing filtration rate to keep up with increasing storm events. Care must be taken to over estimate amount of water that is required for filtration. Consider designing drainage capacity to be 2-4 times the expected amount of water required for filtration to adequately plan for unexpected storm events and higher emergency flow rates.
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